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- /* Copyright (C) 2007-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <sysdep.h>
- #include <sys/mman.h>
- int
- posix_madvise (void *addr, size_t len, int advice)
- {
- /* We have one problem: the kernel's MADV_DONTNEED does not
- correspond to POSIX's POSIX_MADV_DONTNEED. The former simply
- discards changes made to the memory without writing it back to
- disk, if this would be necessary. The POSIX behavior does not
- allow this. There is no functionality mapping the POSIX behavior
- so far so we ignore that advice for now. */
- if (advice == POSIX_MADV_DONTNEED)
- return 0;
- INTERNAL_SYSCALL_DECL (err);
- int result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice);
- return INTERNAL_SYSCALL_ERRNO (result, err);
- }
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